UAVs have recently increased in the market due to their high relocation flexibility based on dynamic demands[1]}, [2]}. They are expected to play an essential rule in next-generation wireless networks [3]}, [4]}. UAVs can be very useful in both rural and urban areas [5]}, such as improving the quality of service [6]}, providing service to remote Internet of Things users [7]}, maintaining connectivity in nature disasters [8]} and providing additional capacity [9]}. However, UAVs cannot work without frequent charging, which highly restricts the performance of UAV-enabled wireless networks. Since UAVs rely on their internal batteries, which are energy limited, their services are likely to be interrupted if the energy runs low. Meanwhile, compared with EVs, UAV-assisting networks are still new, and their infrastructures are poor. While researchers mainly focus on investigating the communication or application parts of UAV-involved networks, the infrastructures of UAVs, such as the deployment of charging stations, should catch up [5]}.
